// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GEOMETRY_SIZE_F_H_
#define UI_GFX_GEOMETRY_SIZE_F_H_

#include <cmath>
#include <iosfwd>
#include <string>

#include "base/compiler_specific.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/gfx_export.h"

namespace gfx {

// A floating version of gfx::Size.
class GFX_EXPORT SizeF {
public:
    SizeF()
        : width_(0.f)
        , height_(0.f)
    {
    }
    SizeF(float width, float height)
        : width_(fmaxf(0, width))
        , height_(fmaxf(0, height))
    {
    }
    ~SizeF() { }

    explicit SizeF(const Size& size)
        : SizeF(static_cast<float>(size.width()),
            static_cast<float>(size.height()))
    {
    }

    float width() const { return width_; }
    float height() const { return height_; }

    void set_width(float width) { width_ = fmaxf(0, width); }
    void set_height(float height) { height_ = fmaxf(0, height); }

    float GetArea() const;

    void SetSize(float width, float height)
    {
        set_width(width);
        set_height(height);
    }

    void Enlarge(float grow_width, float grow_height);

    void SetToMin(const SizeF& other);
    void SetToMax(const SizeF& other);

    bool IsEmpty() const { return !width() || !height(); }

    void Scale(float scale)
    {
        Scale(scale, scale);
    }

    void Scale(float x_scale, float y_scale)
    {
        SetSize(width() * x_scale, height() * y_scale);
    }

    std::string ToString() const;

private:
    float width_;
    float height_;
};

inline bool operator==(const SizeF& lhs, const SizeF& rhs)
{
    return lhs.width() == rhs.width() && lhs.height() == rhs.height();
}

inline bool operator!=(const SizeF& lhs, const SizeF& rhs)
{
    return !(lhs == rhs);
}

GFX_EXPORT SizeF ScaleSize(const SizeF& p, float x_scale, float y_scale);

inline SizeF ScaleSize(const SizeF& p, float scale)
{
    return ScaleSize(p, scale, scale);
}

// This is declared here for use in gtest-based unit tests but is defined in
// the gfx_test_support target. Depend on that to use this in your unit test.
// This should not be used in production code - call ToString() instead.
void PrintTo(const SizeF& size, ::std::ostream* os);

} // namespace gfx

#endif // UI_GFX_GEOMETRY_SIZE_F_H_
